109 * 
S.A. NAT., VOL. XV. 
Sli>t, 20th , 1934. By Bernard C. Cotton and F. K. Godfrey. 
C. eximius Perry 1811 (Bulimus ) (= B. earinatw Perry 
1811; = 7. badius Wood 1818: m T. lineatus Lamarck: — T. 
I hid us Kiener: = Monodonta rosea Lamarck: = T. roseus Phil¬ 
ippi: julmineus Kiener: = Elenchus splendidulus Swainson: 
= T. australis Quoy 5c Gaimard: = T. quoyi Philippi: = T. 
picifer Fischer). PL 1, fig. 4. “The Exceptional Cantharidus ” 
Shell imperforate, elongated-conical, solid, rather thick, polished, 
shining; brown, fawn, or rosy, with widely spaced light or dark 
narrow spiral lines, usually four on the penultimate whorl; 
surface faintly spirally densely striate; spire slender, straight- 
sided; apex acute; whorls seven, slightly convex, the last round¬ 
ed at the periphery; aperture fully one third the total length, 
ovate, brilliantly iridescent within, and sulcate; peristome thick¬ 
ened, greenish; columella vertical, toothed below the middle. 
Height 28, diam. 13 mm. Beach, not uncommon, from Mac- 
Donnell Bay to Streaky Bay, including both Gulfs, and dredged 
alive to 20 fathoms. Also Western Australia—Eyres Sandpatch, 
Ksperance Bay, Albany, Rottnest Island, Yallingug and Ellens- 
brook. (Type locality [C. eximius] —Tasmania). According to 
Hedley, this species spreads along the whole of extra-tropical 
Australia; Hedley :>\v it at Caloundra (Queensland), and Mav 
refers to it as common in Tasmania. The shape of the shell is 
moulded by its environment, for the mollusc lives not on rocks 
but ever afloat on swaying bands of kelp. The stream has no 
grip on the smooth lines of C. eximius, as it would have on a 
normal keeled pyramidal Cantharidns. Some land shells living 
on twigs and leaves have assumed a like form under like condi¬ 
tions (Hedley). This species is very variable in shape and size 
when adult, and in its colouration, as suggested by its many 
names, but all the variants graduate into one another. At Cornv 
Point two variants were taken. One livid brown colour with 
bluish nacreous aperture, the other rosy colour with reddish 
nacreous aperture, but there are many intermediates. 
C. peroni Phi 
— T. julmineus Kiener). “Peron’s CantharidusA Imperfor¬ 
ate, elongate-conic, pointed, exactly like CL eximius Perry, in 
contour; polished, purplish-pink, darker towards the apex, with 
longitudinal zigzag or flexuous white lines or stripes. Height 
30 diam. 14 mn Beach, not n m< n, fn m Be ichport to 
Streaky Bay; and dredged. Investigator Strait, 20 fathoms. 
; Type locality—South Australian coasts). Appears to differ 
from E. eximius Perry, chiefly in the longitudinal white lines, 
and is but a variant of that species. 7L julmineus Kiener, is 
founded on a specimen with very numerous oblique lines. 
